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Quad Pingable LFO
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4ms Quad Pingable LFO
Eurorack Module User Manual v2013-04-25 (initial release)
The Quad Pingable LFO (QPLFO) from 4ms Company is a compact, playable four-channel tap-tempo, pingable
(clock-syncable) LFO with variable skew and reset. Each channel's speed is set by a Tap Tempo button or an
external clock ( ). Each channel can be with a latching button and with an external trigger. The Ping Muted Reset
Skew CV and knob allow for a variety of waveshapes without losing sync to the ping clock. A plethora of headers
allows for connection to other modules, including the 4ms Quad Clock Distributor, the 4ms VCA Matrix, the 4ms
SISM, and the Toppobrillo Mixiplexer. Several advanced features are hidden within the QPLFO: Floating Reset
mode, one-shot mode, "mutli-shot" mode, Fire-on-unmute, Bipolar/Unipolar outputs, and more...
The QPLFO is designed to be useful in small portable systems that require maximum functionality in minimal
space, as well as large systems that need maximum modulation sources.
The QPLFO has a variety of uses:
•Four LFOs with mutes
•Master tap clock
•Clock delay (Clock phase shifting)
•Quadrature LFO
•Square/Pulse to Triangle/Ramp waveshaper
•One-shot
DOWNLOAD MOST RECENT MANUAL AT:
http://4mspedals.com/qplfo.php
Basic features:
•Quad “pingable” LFO's – frequency is set by time between pulses ("ping")
•Each of the 4 channels is an independent LFO
•Can produce a variety of waveshapes: triggers, to near-expo "pluck", to ramp-down, to triangle, to ramp-up, and all
shapes in-between
•Channels can easily modulate, trigger, and reset each other for complex and slowly morphing outputs
•Slowest period is 71 minutes (0.0002 Hz), fastest speed is about 500Hz (marginal tracking up to 1kHz)
•Tap tempo button is free-running (LFO runs indefinitely), but external clock/Ping is auto-stopping (LFO stops when
external clock stops)
Controls and jacks:
•Tap tempo button ("Ping") for manually setting the tempo
•Ping jack sets tempo with an external clock (any signal can be used)
•On/mute button enables or mutes the output (latching button)
•Skew knob and CV jack control the waveshape by altering the ratio between rise and fall times
•At 0% Skew (0V of CV), the shape is a 10ms trigger
•At 1% Skew is a near-exponential "pluck"
•As Skew increase to about 3%, it becomes less exponential and more linear
•At about 3% Skew, the shape is linear ramp-down
•At 50% Skew (about 5V of CV), the shape is triangle
•At 100% Skew (about 10V of CV), the shape is ramp-up
•Skew knob provides offset to the incoming CV signal, so any range of CV is acceptable
•Reset jack restarts the LFO without changing the tempo (rising edge triggered)
•OUT jack outputs either a 0 to 10V waveshape, or a -5V to +5V waveshape (jumper selectable)
•LED flashes and dims to the signal on the OUT jack
•Tap tempo button flashes to the internal tap-tempo clock or to incoming pulses on the Ping jack
•On/Mute button lights up when channel is On
Advanced
•Ping and Reset inputs use comparators, so any waveshape can be used for triggering (audio waves, complex LFOs,
even the QPLFO itself!)
•Trim-pot on PCB allows for adjustment of comparator threshold value
•"Fire-on-unmute" jumper per channel:
•When this optional jumper is installed, pressing the On button to turn the channel on will reset the LFO.
•If the jumper is installed (factory default), pressing On will unmute the LFO without resetting (LFO runs in not
the background when muted)
•Bipolar/Unipolar jumper:
•Setting jumper to Bipolar makes the outputs -5V to +5V
•Setting jumper to Unipolar makes the outputs 0V to +10V
•One jumper controls all four channels
•One-shot mode: Reset jack can be used to trigger a one-shot envelope if the external ping clock is stopped. See
section below for detailed discussion
•Floating Reset mode: Holding a high gate on Reset jack allows the waveshape to run freely without automatically re-
syncing to the ping clock. A bare cable plugged into the jack causes a high gate
•Connects to other modules using ribbon cables:
•Outputs can connect to the 4ms VCA Matrix, or the 4ms SISM, or the Toppobrillo Mixiplexer
•Normalization of ping jacks can connect to the 4ms Quad Clock Distributer
Dimensions
•12 HP Eurorack format module
•1.57” (40 mm) deep
Power consumption
+12V rail:
89mA max with 5V Source jumper selecting external 5V
154mA max with 5V Source jumper selecting internal 5V
+5V rail:
65mA max with 5V Source jumper selecting external 5V
not used with 5V Source jumper selecting internal 5V
-12V rail:
73mA max
Page 2
Your first QPLFO patch
The QPLFO is a different kind of LFO than you might be used to. Rather than setting the speed with a knob and/or CV jack
like a traditional LFO, the QPLFO sets the speed by using an external clock or tap button. To do anything with the QPLFO you
first need to give it a Ping. Let's get started with your first patch:
1. Start by tapping in a tempo on the red channel: just press the top Ping button twice
Instantly, the button will flash to your tempo, and keep running.
2. Press the On button and it will light up orange.
When this button is off, the channel is muted (no output).
The Ping button will continue to flash even if a channel is muted,
so you can see what tempo it'll be when you unmute it
3. Plug the OUT jack into something you want to modulate (try the pitch of a VCO, or run one VCO into a
VCA and then into the FM of another VCO, and use the QPLFO to open up the VCA).
When the On button is lit up, notice that the LED by the OUT jack will also be flashing.
The brightness of this LED follows the signal of the output.
4. Play with the Skew knob and listen to how the waveshape changes. Notice how the total frequency (or
period) of the output does not change. Technically, Skew sets the ratio between the rise and fall times without
changing the total time.
For most of the range, the waveshape will be linear rise and fall.
But when Skew is at 0%, the output will be a sharp attack with sharp drop-off... similar to an expo curve
(technically it's a quadratic curve). If you nudge Skew up just a hair, it will output a linear Ramp-down sawtooth
shape. At center it will do a Triangle wave. All the way up, you get a Ramp-up shape.
Now try .sync'ing the QPLFO channel to an external clock
Plug a clock, or anything, into the Ping jack. Maybe an RCD or SCM output, or the output of
another LFO or cycling envelope, or a VCO at a very slow speed.
The Ping button will light up when a signal is present on the jack, and will switch from running
at your tap-tempo to the incoming clock's tempo.
Next, let's play with . Plug a manual gate/trigger (or a really slow clock) into the Reset jack.Reset
The LFO will start over each time it receives a signal on this jack.
(See below for a technical description of what Reset is actually doing.)
Now try a fun trick: modulate Skew of one channel with another channel's output.
Set the red channel tempo to about 1-3 cycles per second.
Tap the blue channel's Ping button once. Listen to the red channel make 8 cycles, and
then tap the blue Ping a second time.
Plug the blue channel output into the red channel Skew CV jack.
Turn the red channel Skew knob all the way down.
Turn blue channel Skew to triangle (center).
You should be hearing the red channel skew shift from falling ramp to triangle to rising
ramp.
You can mute the blue channel to make the red channel go back to a static waveshape.
If you want to get chaotic, mult or stack the red channel output, and plug it back into the blue channel's Skew. Keep going, try
chaining all 4 channels together, plug into Reset and Ping, it's easy to get crazy quick...
Here's another fun trick: .One-shot mode
First, you have to arm it by stopping your clock:
•If you're running an external clock into Ping, either
stop it at the source, or unplug the Ping jack.
•If you're using Tap tempo, then tap the button three
times and hold it down on the third time for 2 seconds.
•The orange button should be lit up (unmuted) but the
channel should not be running. This is "armed."
To trigger a one-shot, give a pulse on the reset jack. You can
plug Reset into a trigger pad (Synthwerks FSR, or Makenoise
Pressure Points, or FoH Choices...). in a pinch you can Hint:
use a bare cable by touching the tip to metal (cheap and dirty
hack, but it works!)
Page 3
Produktspecifikationer
| Varumärke: | 4ms |
| Kategori: | Tangentbord |
| Modell: | Quad Pingable LFO |
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